Member Avatar for ank_arsenal

hey
i need your help in creating graphs in java language

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There are three different problems people call "graphs" or "maps" — plotting charts, building graph data structures (nodes/edges for routing), and rendering geographic maps. Decide which you mean first. 's reply assumed drawing; pointed toward the Java Map API. Each need a different approach and toolset.

For charting (bar/line/pie) the fastest route is a chart library such as JFreeChart (JFreeChart). For custom visuals you can draw directly with Java2D or JavaFX Canvas: prepare the data model, pick axes/scale, then render and export to PNG/SVG/PDF. Use an existing chart library unless you need a very custom look.

If you mean a graph data structure for routing (a road network, for example), use a graph library rather than hand-rolling algorithms. JGraphT is a solid choice for in-memory graphs and algorithms (JGraphT). Model intersections as vertices, roads as weighted edges (distance/time). Minimal JGraphT example:

import org.jgrapht.*;
import org.jgrapht.graph.*;

Graph<String, DefaultWeightedEdge> g = new SimpleWeightedGraph<>(DefaultWeightedEdge.class);
g.addVertex("A");
g.addVertex("B");
DefaultWeightedEdge e = g.addEdge("A", "B");
g.setEdgeWeight(e, 12.3);

For geographic maps / GIS you will want tools that handle projections, shapefiles and spatial indexes — GeoTools and the JTS topology suite are standard choices (JTS). Use tile servers (OSM) or vector data depending on scale; keep model (graph/geometries) separate from rendering.

Practical tips: store coordinates and attributes on vertices, use spatial indexes (R-tree) for large datasets, cache rendered tiles, and profile before optimizing. If you post a short sample of the data you have and the exact goal (draw chart, compute routes, or render GIS), it will be much easier to give concrete code — as suggested, include code and sample data.

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Member Avatar for jasimp

Post your code and ask specific questions. Read the rules.

Member Avatar for ank_arsenal

i need to construct a map
can you give me guidance on how to achieve this goal???
i was of thinking about creating graphs but is there any other way as well if not
can you help me if creating a data structure graph??/

Member Avatar for darkagn

The Java API contains documentation for the java.util.Map interface that might be handy. Have a read of it and repost if you are still unsure what to do.

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